CN113880304A - Iron-containing sewage purification treatment process - Google Patents
Iron-containing sewage purification treatment process Download PDFInfo
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- CN113880304A CN113880304A CN202111279120.6A CN202111279120A CN113880304A CN 113880304 A CN113880304 A CN 113880304A CN 202111279120 A CN202111279120 A CN 202111279120A CN 113880304 A CN113880304 A CN 113880304A
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- sewage
- iron
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 98
- 239000010865 sewage Substances 0.000 title claims abstract description 89
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 title claims abstract description 41
- 230000008569 process Effects 0.000 title claims abstract description 37
- 238000000746 purification Methods 0.000 title claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 66
- 239000000463 material Substances 0.000 claims abstract description 30
- 238000002347 injection Methods 0.000 claims abstract description 20
- 239000007924 injection Substances 0.000 claims abstract description 20
- 238000004581 coalescence Methods 0.000 claims abstract description 18
- -1 iron ion Chemical class 0.000 claims abstract description 12
- 239000003153 chemical reaction reagent Substances 0.000 claims abstract description 8
- 238000006243 chemical reaction Methods 0.000 claims abstract description 4
- 238000001914 filtration Methods 0.000 claims description 37
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical group OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 12
- 239000000701 coagulant Substances 0.000 claims description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 6
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 claims description 4
- 229910052573 porcelain Inorganic materials 0.000 claims description 4
- 239000004576 sand Substances 0.000 claims description 4
- 235000009496 Juglans regia Nutrition 0.000 claims description 3
- 239000006004 Quartz sand Substances 0.000 claims description 3
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 claims description 3
- 239000003830 anthracite Substances 0.000 claims description 3
- 238000011049 filling Methods 0.000 claims description 3
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 3
- 150000002910 rare earth metals Chemical class 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- 235000020234 walnut Nutrition 0.000 claims description 3
- 238000000151 deposition Methods 0.000 claims description 2
- 238000005086 pumping Methods 0.000 claims description 2
- 240000007049 Juglans regia Species 0.000 claims 1
- 238000013327 media filtration Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 6
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 abstract description 5
- 230000003647 oxidation Effects 0.000 abstract description 2
- 238000007254 oxidation reaction Methods 0.000 abstract description 2
- 239000013049 sediment Substances 0.000 abstract 1
- 239000007787 solid Substances 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 16
- 239000010410 layer Substances 0.000 description 8
- 239000002245 particle Substances 0.000 description 7
- 239000012535 impurity Substances 0.000 description 6
- 239000007788 liquid Substances 0.000 description 6
- 230000007797 corrosion Effects 0.000 description 5
- 238000005260 corrosion Methods 0.000 description 5
- 239000003814 drug Substances 0.000 description 5
- 239000008394 flocculating agent Substances 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- MBMLMWLHJBBADN-UHFFFAOYSA-N Ferrous sulfide Chemical compound [Fe]=S MBMLMWLHJBBADN-UHFFFAOYSA-N 0.000 description 3
- 230000002378 acidificating effect Effects 0.000 description 3
- 229960004887 ferric hydroxide Drugs 0.000 description 3
- IEECXTSVVFWGSE-UHFFFAOYSA-M iron(3+);oxygen(2-);hydroxide Chemical compound [OH-].[O-2].[Fe+3] IEECXTSVVFWGSE-UHFFFAOYSA-M 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- 238000004062 sedimentation Methods 0.000 description 3
- 241000758789 Juglans Species 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000033558 biomineral tissue development Effects 0.000 description 2
- 239000000084 colloidal system Substances 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910001448 ferrous ion Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- VTLYFUHAOXGGBS-UHFFFAOYSA-N Fe3+ Chemical compound [Fe+3] VTLYFUHAOXGGBS-UHFFFAOYSA-N 0.000 description 1
- 238000005273 aeration Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005119 centrifugation Methods 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 229910001447 ferric ion Inorganic materials 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- FLTRNWIFKITPIO-UHFFFAOYSA-N iron;trihydrate Chemical compound O.O.O.[Fe] FLTRNWIFKITPIO-UHFFFAOYSA-N 0.000 description 1
- 238000005374 membrane filtration Methods 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000008213 purified water Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/722—Oxidation by peroxides
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
- C02F2101/203—Iron or iron compound
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/10—Nature of the water, waste water, sewage or sludge to be treated from quarries or from mining activities
Abstract
The invention relates to the technical field of oilfield sewage treatment, in particular to a process for purifying and treating iron-containing sewage. The utility model provides a ferric sewage purification treatment process, sewage adds the reagent after the prefiltering suspended solid, mixes the abundant reaction through the line mixer, gets rid of the iron ion of gathering oxidation in the coalescence swash plate settling cask, gets into the middle settling cask and filters the sediment once more with the sewage of getting rid of the iron ion, later rivers discharge many medium filter material jar through the elevator pump, pours into the oil field pipeline into through the water injection jar at last. The invention provides the oilfield ferrous sewage purification treatment system with simple process and good treatment effect, which purifies the ferrous sewage generated in oilfield development, can ensure that the water quality reaches the standard above A2 grade after the oilfield ferrous sewage is treated, meets the water injection requirement of a low-permeability stratum, and is suitable for treating the water quantity not more than 3000m per day3Of (2) medium and smallA type treatment water station.
Description
Technical Field
The invention relates to the technical field of oilfield sewage treatment, in particular to a process for purifying and treating iron-containing sewage.
Background
During the process of oil field production liquid exploitation and gathering and transportation, sigma Fe in sewage exceeds standard due to formation, corrosion, bacteria, air oxidation and the like, and due to the instability of ferrous ions, when oxygen is fed into a system or a well is washed, the ferrous ions are oxidized into ferric ions to form ferric hydroxide colloid (the main component of Fe is Fe) after oxygen exposure of a water body2O3、Fe(OH)3) When precipitates are generated, suspended matters in water exceed the standard, the water injection effect and the well washing quality of a water injection well are influenced, and the corrosion on ground treatment equipment, process pipelines and water injection equipment is directly or indirectly participated in, when corrosion products, namely ferrous sulfide and ferric hydroxide are injected into a stratum along with water, particles such as ferrous sulfide are large, and serious damage is caused to a reservoir stratum; the ferric hydroxide colloid particles are fine, and the water quality can not reach the standard by the conventional treatment process; and the treatment cost is higher by using fine filtration technologies such as membrane filtration and the like.
The related patents of the iron-containing sewage treatment device and the process focus on a medicament reaction or aeration process for treating the high iron-containing oil field sewage; or a method for removing ferrous sulfide in petroleum industry pipelines and equipment; the related iron-containing sewage treatment device has the disadvantages of complex process equipment and high investment, and cannot meet the purification treatment requirement of low iron-containing sewage (less than 5 mg/L). For example: a crude oil-containing sewage treatment method-CN 200510043343.7, an industrial iron-containing sewage treatment and recycling system-CN 201220217764.2, a method for removing iron in sewage-CN 201210595505.8 and the like.
Disclosure of Invention
The invention aims to provide an oilfield iron-containing sewage purification treatment system with simple process and good treatment effect,the method utilizes coalescence inclined plate sedimentation equipment and multi-medium filtration technology to purify and treat the iron-containing sewage generated in oil field development, can ensure that the water quality reaches the standard above A2 grade after the iron-containing sewage of the oil field is treated, meets the water injection requirement of low permeability stratum, is suitable for treating low iron content and daily treated water quantity not more than 3000m3The medium and small-sized water treatment station.
The technical scheme provided by the invention is as follows:
a process for purifying and treating the sewage containing iron includes such steps as filtering the suspended substance in sewage, adding reagent, mixing in pipeline mixer, full reaction, removing the iron ions from the sewage, filtering, depositing, pumping the water to multi-medium filter tank, and filling it in oil field pipeline;
the reagent is hydrogen peroxide, flocculant, coagulant aid and pH regulator.
Specifically, sewage is primarily filtered for suspended matters in a double-filter-material filtering tank, and anthracite and quartz sand are arranged in the double-filter-material filtering tank to form a filtering layer.
Specifically, a plurality of dosing ports are arranged between the double-filter-material filtering tank and the pipeline mixer.
Specifically, the coalescence inclined plate settling tank adopts a horizontal structure, and a rectification component is arranged in the coalescence inclined plate settling tank.
Concretely, middle settling cask is including a jar body, jar body bottom sets up the fourth drain, set up the blowoff valve on the pipeline of fourth drain, the internal fixed plate that sets up of jar, fixed surface sets up first motor under the fixed plate, the fixed whirl blade that sets up on the first rotation axis of first motor, fixed surface sets up the second motor on the fixed plate, fixed second filter and the third filter screen of setting on the second rotation axis of second motor, the second filter level sets up, the internal slope of jar is fixed and is set up first filter screen, first filter screen is located the top of second filter, be provided with the fourth export on the jar body and be located the top of first filter screen, be provided with the fourth import on the jar body and be located the below of third filter screen.
Preferably, the included angle between the first filter screen and the horizontal plane is 0.5-3 degrees.
Preferably, meshes of the net bodies of the third filter net, the second filter net and the first filter net become smaller in sequence.
Preferably, the multi-medium filter tank adopts a multi-layer filter material for forward filtration, the filter material comprises walnut shells, rare earth porcelain sand and magnetite, and the density grade difference of the filter material from top to bottom is 2.
Preferably, the water injection tank is also provided with a water return port connected with an inlet of the lift pump.
The invention has the following technical effects:
1. the invention relates to a process for purifying and treating iron-containing sewage, and provides a system for purifying and treating the iron-containing sewage in an oil field, which has simple process and good treatment effect, can purify and treat the iron-containing sewage generated in the development of the oil field, can ensure that the water quality reaches the standard above A2 grade after the iron-containing sewage in the oil field is treated, meets the water injection requirement of a low-permeability stratum, is suitable for treating the water quantity not more than 3000m per day3The medium and small-sized water treatment station.
2. The invention utilizes the special structure of the coalescence inclined plate settling tank and the density grade difference technology of the filter material of the multi-medium filter tank to fully filter suspended particles with small grain size and meet the water injection requirement of low-permeability stratum.
3. The method can experimentally adjust the dosage of the oxidant, the flocculating agent and the pH value regulator, can completely purify and treat the iron-containing sewage, and is suitable for the purification treatment requirement of the low iron-containing sewage (less than 5 mg/L).
4. The water quality of the iron-containing sewage treated by dosing, twice sedimentation and twice filtration does not contain iron, the water quality reaches the standard above A2 level, the purification treatment of the iron-containing sewage is realized, and the problems in the prior art are effectively solved.
5. The process equipment can be designed in a complete skid-mounted manner, and has the characteristics of simplified process, convenience in installation, stable and reliable operation and control, clear functions of all parts, high effective utilization rate, high automation degree and the like.
Drawings
FIG. 1 is a diagram of an apparatus for carrying out the process of the present invention;
FIG. 2 is a schematic structural view of an intermediate settling tank;
FIG. 3 is a cross-sectional view of an intermediate settling tank;
fig. 4 is a schematic structural diagram of the first filter screen, the second filter screen, and the third filter screen.
1 double-filter-material filtering tank 1-1, first inlet 1-2, first outlet 1-3 and first drain outlet
2 a pipeline mixer 3, a coalescence inclined plate settling tank 3-1, a third outlet 3-2 and a third sewage outlet
3-3 third oil drain port 4 middle settling tank 4-1 fourth outlet port 4-2 fourth sewage draining port
4-3 fourth inlet 4-4 blowoff valve 4-5 first motor 4-6 first rotation axis
4-7 second motor 4-8 swirl vane 4-9 net body 4-10 second rotating shaft
4-11 fixed plate 4-12 first filter 4-13 second filter
4-14 third filter screen 5, lift pump 5-1, fifth outlet 6 multi-medium filter material tank
6-1 sixth outlet 6-2 sixth sewage draining outlet 7 water injection tank 7-1 seventh outlet
7-2 a water return port 8, a first medicine adding port 9, a second medicine adding port 10 and a third medicine adding port.
Detailed Description
A process for purifying and treating iron-containing sewage comprises the steps of adding a reagent into the sewage after primarily filtering suspended matters, fully mixing and reacting through a pipeline mixer (2), removing iron ions accumulated and oxidized in a coalescence inclined plate settling tank (3), feeding the sewage with the iron ions removed into an intermediate settling tank (4) for secondary filtration and precipitation, discharging water into a multi-medium filtering material tank (6) through a lifting pump (5), and finally injecting the water into an oil field pipeline through a water injection tank (7); the reagent is hydrogen peroxide, flocculant, coagulant aid and pH regulator.
The equipment for implementing the iron-containing sewage purification treatment process comprises a double-filter-material filter tank 1, a pipeline mixer 2, a coalescence inclined plate settling tank 3, an intermediate settling tank 4, a multi-medium filter material tank 6, a water injection tank 7, a lift pump 5 and process pipelines.
The double-filter-material filtering tank 1 is provided with a first inlet 1-1, a first outlet 1-2 and a first sewage discharge port 1-3, wherein the first outlet 1-2 is connected with a pipeline mixer 2 and is used for preliminarily filtering suspended matters in sewage to reduce the burden of a subsequent treatment process. Anthracite and quartz sand are arranged in the double-filter material filtering tank (1) to form a filtering layer.
The liquid inlet of the pipeline mixer 2 is connected with the double-filter material filtering tank 1, and a first dosing port 8, a second dosing port 9 and a third dosing port 10 are arranged on a connecting pipeline. The liquid outlet of the pipeline mixer 2 is connected with a coalescence sloping plate settling tank 3. Adding reagents such as hydrogen peroxide, a flocculating agent, a coagulant aid, a pH regulator and the like through the first dosing port 8, the second dosing port 9 and the third dosing port 10, fully mixing through the pipeline mixer 2, fully reacting, gathering oxidized iron ions under the action of the flocculating agent and the coagulant aid, and removing the iron ions in the coalescence inclined plate settling tank 3; the PH regulator can regulate the pH value of sewage, reduce the corrosion of acidic water on subsequent steel tanks and pipes and reduce the rising probability of suspended matters in subsequent processes.
The coalescence inclined plate settling tank 3 is provided with a third outlet 3-1, a third sewage draining outlet 3-2 and a third oil draining outlet 3-3. A liquid inlet at the front end of the coalescence inclined plate settling tank 3 is connected with the pipeline mixer 2, and a third outlet 3-1 is connected with the middle settling tank 4. The coalescence inclined plate settling tank 3 adopts a horizontal structure, sewage flows through the coalescence inclined plate settling tank in a horizontal mode, and secondary pollution caused by remixing of the sewage in the conventional coagulation or inclined plate settling tank separation process is avoided; the rectification component is attached inside, so that the rectification effect on water flow is good, and the sewage is kept in a stable laminar flow state at a high flow speed as far as possible; and an advanced variable frequency speed control system is arranged at the third outlet 3-1, so that the liquid level of the water chamber is kept stable, and the stable operation of equipment is ensured.
The middle settling tank (4) comprises a tank body, a fourth sewage draining outlet (4-2) is arranged at the bottom of the tank body, a sewage draining valve (4-4) is arranged on a pipeline of the fourth sewage draining outlet (4-2), a fixing plate (4-11) is fixedly arranged in the tank body, a first motor (4-5) is fixedly arranged on the lower surface of the fixing plate (4-11), a first rotating shaft (4-6) of the first motor (4-5) is fixedly provided with a cyclone blade (4-8), the upper surface of the fixing plate (4-11) is fixedly provided with a second motor (4-7), a second rotating shaft (4-10) of the second motor (4-7) is fixedly provided with a second filter plate (4-13) and a third filter plate (4-14), the second filter plate (4-13) is horizontally arranged, a first filter plate (4-12) is obliquely and fixedly arranged in the tank body, the first filter screen (4-12) is positioned above the second filter screen (4-13), the tank body is provided with a fourth outlet (4-1) and positioned above the first filter screen (4-12), and the tank body is provided with a fourth inlet (4-3) and positioned below the third filter screen (4-14).
The included angles between the first filter screen (4-12) and the third filter screen (4-14) and the horizontal plane are all 1 degree, so that the second filter screen (4-13) and the third filter screen (4-14) can be prevented from generating larger vibration in the rotating process.
The meshes of the net body (9) on the third filter screen (4-14), the second filter screen (4-13) and the first filter screen (4-12) become smaller in sequence.
Sewage enters the tank body through the fourth inlet 4-3, then the first motor 4-5 is started, the first motor 4-5 drives the rotational flow blades to rotate through the first rotating shaft 4-6, so that the sewage forms rotational flow, suspended matters in the sewage are separated and sink through centrifugal force, the rotational flow sewage is gathered to the fourth sewage outlet 4-2, and when the sewage is excessively accumulated, the sewage valve 4-4 is opened to discharge the sewage.
Because the upper part of the rotational flow sewage is blocked by the first filter screen 4-12, the second filter screen 4-13 and the third filter screen 4-14, the rotational flow sewage cannot be formed above the rotational flow sewage, the water flow flows slowly and forms a turbulent layer, the sewage with the deposited impurities is arranged above the first filter screen 4-12, namely, the impurities with larger particles are deposited by centrifugation, and the upward flowing sewage only contains the impurities with smaller particles.
When the impurities among the first filter screen 4-12, the second filter screen 4-13 and the third filter screen 4-13 are excessive, the second motor 4-7 is started, the second motor 4-7 drives the second rotating shaft 4-10 to rotate, and the second filter screen 4-13 and the third filter screen 4-14 are driven to rotate together. The local space between the first filter screen 4-12 and the third filter screen 4-14 is changed in size continuously to form pressure difference changes with different sizes, so that water flow can act on impurities accumulated among the first filter screen 4-12, the second filter screen 4-13 and the third filter screen 4-14, and the net body 9 is washed.
The multi-medium filtering tank 6 is provided with an outlet6-1 and drain 6-2, export 6-1 connects water injection jar 7, and multi-media filter tank adopts the forward filtration of multilayer filter material, and main filter medium comprises walnut shell, tombarthite porcelain sand and magnetite, and multi-media filter tank's filter material top-down's density difference is 2, adopts the three-layer filter material to set up the density ratio in this embodiment and is: 1.23/2.4/4.8g/cm3And the filter material mixing layer can not be caused. Because the magnetite is positioned below the rare earth porcelain sand layer and is not easy to lose, the whole filtering layer reduces the problems of low pollutant carrying capacity, surface filtering phenomenon, filter material loss and the like of the single-layer forward filter.
The water injection tank (7) is also provided with a water return port (7-2) which is connected with an inlet of the lift pump (5) and can reversely clean the multi-medium filter tank.
During operation, sewage separated from oil field output liquid enters the double-filter material filter 1 to primarily filter suspended matters in the sewage. Adding hydrogen peroxide, a flocculating agent, a coagulant aid and a pH regulator into the filtered sewage through a medicine adding port respectively, fully mixing the sewage by a pipeline mixer 2, fully reacting, and removing oxidized iron ions in a coalescence inclined plate settling tank 3 under the action of the flocculating agent and the coagulant aid; the PH regulator can regulate the pH value of sewage, reduce the corrosion of acidic water on subsequent steel tanks and pipes and reduce the rising probability of suspended matters in subsequent processes. The effluent of the coalescence inclined plate settling tank enters an intermediate settling tank 4, the effluent of the intermediate settling tank is lifted by a lifting pump 5 and enters a multi-medium filtering material tank 6, and the multi-medium filtering material tank further filters impurities with small particle sizes in the water, and the water is injected into a water injection tank 7 after reaching the water quality requirement of purified water.
The water quality of the iron-containing sewage after the treatment of dosing, twice sedimentation and twice filtration does not contain iron, the water quality reaches the standard above A2 level, the water injection requirement of a low-permeability stratum can be met, the purification treatment of the iron-containing sewage is realized, and the problems in the prior art are effectively solved.
The invention discloses a process for purifying and treating iron-containing sewage and a device combination for realizing the process, which can ensure that the water quality reaches the standard above A2 grade after the iron-containing sewage of an oil field is treated, meet the water injection requirement of a low permeability stratum and are suitable for treating low iron-containing sewage (less than 5mg/L) and medium and small-sized water treatment stations with daily water treatment amount not more than 3000m 3.
The invention relates to a combined station of a central petrochemical northwest oil production plant I, which is built by the technology of the invention and has the scale of 2000m3The production device of/d is used for producing turbid and opaque sewage with the turbidity larger than 30mg/L, the water temperature of 32-35 ℃, the iron content of 4-37mg/L, the mineralization degree of 20 ten thousand mg/L and CL before treatment-The content is 13 ten thousand mg/L, the salt is high salinity and high salt water, the PH is 5-6, and the salt is acidic water.
According to the water quality with high mineralization degree of the Tahe, the experiment determines that the dosage of the hydrogen peroxide is 60-90 mg/L; adding 80-120 mg/L of flocculant; 0.6-0.8 mg/L coagulant aid; proper amount of pH value regulator.
The water quality after treatment has oil content less than 6mg/L, suspended matter less than 2mg/L, median particle size less than 1.5 μm, and iron content of 0. According to 'water quality index and analysis method for clastic rock reservoir water injection' SY/T5329-94, the standard requirement of A2 level is met, and the water quality requirement of low-permeability water injection of the oil field is met.
Claims (9)
1. A process for purifying and treating iron-containing sewage includes such steps as filtering suspended substance in sewage, adding reagent, mixing in pipeline mixer (2), full reaction, removing iron ions accumulated and oxidized in the inclined plate settling tank (3), filtering in intermediate settling tank (4), depositing, pumping the water to multi-medium filtering tank (6), and filling it in oil field pipeline via water filling tank (7);
the reagent is hydrogen peroxide, flocculant, coagulant aid and pH regulator.
2. The iron-containing sewage purification treatment process according to claim 1, wherein the sewage is subjected to preliminary filtration of suspended matters in the double-filter material filtration tank (1), and anthracite and quartz sand are arranged in the double-filter material filtration tank (1) to form a filtration layer.
3. The iron-containing sewage purification treatment process according to claim 2, wherein a plurality of chemical feeding ports are arranged between the double-filter material filtering tank (1) and the pipeline mixer (2).
4. The iron-containing sewage purification treatment process according to claim 1, wherein the coalescence inclined plate settling tank (3) adopts a horizontal structure, and a rectification assembly is arranged in the coalescence inclined plate settling tank (3).
5. The iron-containing sewage purification treatment process according to claim 1, wherein the intermediate settling tank (4) comprises a tank body, a fourth sewage discharge outlet (4-2) is arranged at the bottom of the tank body, a sewage discharge valve (4-4) is arranged on a pipeline of the fourth sewage discharge outlet (4-2), a fixed plate (4-11) is fixedly arranged in the tank body, a first motor (4-5) is fixedly arranged on the lower surface of the fixed plate (4-11), a first rotating shaft (4-6) of the first motor (4-5) is fixedly provided with a swirl vane (4-8), a second motor (4-7) is fixedly arranged on the upper surface of the fixed plate (4-11), a second filtering plate (4-13) and a third filtering screen (4-14) are fixedly arranged on a second rotating shaft (4-10) of the second motor (4-7), the second filter plate (4-13) is horizontally arranged, the first filter screen (4-12) is obliquely and fixedly arranged in the tank body, the first filter screen (4-12) is positioned above the second filter plate (4-13), the tank body is provided with a fourth outlet (4-1) and positioned above the first filter screen (4-12), and the tank body is provided with a fourth inlet (4-3) and positioned below the third filter screen (4-14).
6. The iron-containing sewage purification treatment process according to claim 5, wherein the included angles between the first filter screen (4-12) and the third filter screen (4-14) and the horizontal plane are 0.5-3 degrees.
7. The iron-containing sewage purification treatment process according to claim 5, wherein the meshes of the net bodies (9) on the third filter screen (4-14), the second filter screen (4-13) and the first filter screen (4-12) become smaller in sequence.
8. The iron-containing sewage purification treatment process according to claim 1, wherein the multi-media filtration tank (6) adopts multi-layer filter material for forward filtration, the filter material comprises walnut shells, rare earth porcelain sand and magnetite, and the density grade difference of the filter material from top to bottom is 2.
9. The iron-containing sewage purification treatment process according to claim 1, wherein the water injection tank (7) is further provided with a water return port (7-2) connected with an inlet of the lift pump (5).
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